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Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.

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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.

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Thyroid conditions may make getting pregnant impossible.

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A cataract is a clouding of the eyes' natural lens. As we age, some clouding of the lens may occur. The first sign of a cataract is usually blurry vision. Although glasses and other visual aids may at first help a person with cataracts, surgery may become inevitable. Cataract surgery is very successful in restoring vision, and it is the most frequently performed surgery in the United States.

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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.

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